Telegraphic transmitting, receiving, and translating arrangement.



' No. 678.505. Patented July l6, 19m.

v A. mam-mm TELEGRAPH") TRANSMITTING, RECEIVING, AND TRANSLATING ARRANGEMENT.

' (Application filed Sept. 5 1900.) (No man.

2 SheetsSheet l.

No. 678,505; Patented July I6, 19m.

A. MUIRHEAD. TELEGRAPHIG TRANSMITTING, RECEIVING, AND TRANSLA TING ARRANGEMENT.

(No Nodal.)

' (Application filed Sept. 5, 1900.)

- 2 Sheets-Sheet 2,

UNITED STATES- PATENT OFF-ICE.

ALEXANDER MUIRHEAD, OF SHORTLANDS, ENGLAND.

TELEGRAPHIC TRANSMITTING, RECEIVING, AND TRANSLATING ARRANGEMENT.

SPECIFICATION forming part of Letters .Batent No. 678,505, dated. July 16, 1901. Application filed September 5 1900. Serial No. 29,088. (No man.)

To aZZ whom it may concern:

Be it known that I, ALEXANDER MUIRHEAD,

a subject of Her Majesty the Queen of Great Britain, residing at Shortlands, in the county of Kent, England, have invented new and use ful Improvements in Telegraphic Transmit ting, Receiving, and Translating Arrangements, of which the following is a specification.

My present invention has for its objects to so construct an automatic telegraph-trans Initter that it can be used either for initial automatic transmission from an original station into a section of telegraph-line or submarine cable or for retransmission of signals from one section of cable into another section in connection with cable-relays and to so arrange and connect the apparatus'that in the latter case curbed signals can be conveyed into the second section of cable.

In the accompanying drawings, Figure 1 is a plan of an automatic curb-transmitter with my improvements added thereto, and Figs. 2 and 3 are respectively front and rear elevationsthereof. Fig. 4 is a diagram illustrating the electrical connections and operations of the mechanisms when used for retransmit ting from one section of cable into another.

My invention can be applied to any form of automatic transmitter and can be used in connection with any form of cable-relay.

The drawings show, by way of illustration, the invention applied to the automatic curbtransmitter patented to me by Letters Patent of the United States No. 577,534, dated February 23, 1897.

In the drawings, a represents the main driving-axle of the automatic transmitter, bis the graduated curbing-cam, and c and d are the lever-governing cams, all substantially as described in the specification of my said prior patent.

e is the curbing-cam lever, andfand g are the levers cooperating, respectively, with the cams c and d.

h and i are the line and earth levers.

jj are the rods that enter. the perforations in the paper strip is when the apparatus is used for'initial transmission, andZ is the spurwheel by which the paper strip is is drawn through the instrument.

According to my present invention I arrange a friction-drive between the drivingpulley m and the main driving-axle a of the instrument, such friction-drive being either normally positive and rendered frictional or normally frictional and rendered positive by the admissionor withdrawal of a pawl actuated by an electromagnet. The drawings show the driving-pulley m as being forced by the spring a against a friction-disk 0, which latter is normally retained stationary by the engagement of the nose p of the pawl q with a detent r in such disk. The bases of the rods jj or some other convenient part of each of the contact-making levers of the instrument have a detent s, with which the nose t of a pawl u, operated by an electromagnet c or w,engages or disengages,as the case may be.

When the instrument is required for use as an initial transmitter, the pawls q u are suitably kept out of engagement from their detents by such means, for instance, as the hand-operated cam-surfaces a; and y. When required for retransmission purposes, the cam-surfaces are so rotated as to have no influence upon the pawls.

From Fig. 4 of the drawings it will be seen how the instrument is utilized for the retransmission of curbed signals.

2 represents the cable, from which it is assumed signals are being received, and 1 the one into which they are to be retransmitted. 2 represents the recorder-coil, and 3 is the contact-tongue operated thereby.

4 and 5 represent relays which, together with the divided plate 6, upon which the contact-tongue 3 rests', are included in the -circuit of the local battery 7. The contact-plate 6 may be a fixture and the tongue 3 vibrated thereon, or, alternatively, it may be mounted and vibrated substantially as described in the specification of prior Letters Patent of the United States granted to me, No. 652,229, dated June 19, 1900. V

8 is a shunted condenser in the battery-circuit.

Assuming an impulse arrivingfrom the cable 2 causes the tongue 3 to move to the left, the tongue of the relay 4 will be deflected and the circuit of the battery 9 completed through the tongue of the relay 4 and the electromagnets o and 10. An arriving impulse of opposite polarity actuates the tongue of the other relay 5 and energizes the electromagnets 10 and 10. In every instance, therefore, one of the pawls u and the pawl q will be removed from the detent with which it cooperates, with the result that one or other of the rodsj is free to rise, putting one pole or the other of the retransmitting-line battery 11 onto the cable 1; but at a point depending upon the lateral position of the lever e upon the curbing-cam b of each elementary signal received the polarity of the split battery 11 will be changed, and consequently curbed signals will be conveyed to the cable 1.

l2 12 are the usual receiving and sending condensers, and 13 represents a connection through a portion of artificial cable 14 or its equivalent from the outgoing circuit back through the receiving apparatus, so as to curb or govern the return movements of the latter.

\Vhat I claim, and desire tosecure by Letters Patent of the United States, is-

1. An automatic telegraph-transmitter comprising, in combination, a main driving-shaft, a friction-drive mounted thereon, an electromagnetically-actuated pawl governing the movements of the main driving-shaft, contact levers, electromagnetically actuated pawls governing the movements of the contact-levers, and means serving,- at will, to retain all the said pawls out of engagement.

2. The combination, at an intermediate cable-station, of a receiver, a local-battery circuit completed through such receiver and through one of two contacts upon or against which such receiver moves, two relays located in said local-battery circuitand through one or other of which the said battery-circuit is completed, an automatic transmitter comprising a frictionally-driven main shaft, contact-making levers, and electromagneticallyactuated pawls governing the movements of the main shaft and the contact-making levers respectively, the clectromagnets being included in a local-battery circuit with the said relay-tongues, and a retransmittingline battery connected through the contact-making levers of the automatic transmitter.

3. The combination, at an intermediate cable-station, of a receiver, a local-battery circuit completed through such receiver and through one of two contacts upon or against which such receiver moves, two relays located in said local-battery circuit and through one or other of which the said battery-circuit is completed,an automatic transmitter comprising a frictionally-driven main shaft, contactmaking levers and electromagnetically-actuated pawls governing the movements of the main shaft and the contact-making levers respectively, the electromagnets being included in a local-battery circuit with the said relaytongues, a retransmitting-line battery connected through the contact-making levers of the automatic transmitter, and means to change the polarity of the last-mentioned battery during the period of each elementary signal.

4. The combination, at an intermediate cable-station, of a receiver, a local-battery circuit completed through such receiver and through one of two contacts upon or against which such receiver moves, two relays located in said local-battery circuit and through one or other of which the said battery-circuit is completed, anautomatic transmitter comprisinga frictionally-driven main shaft, contact-making levers, and electromagneticallyactuated pawls governing the movements of the main shaft and the contact-making levers respectively, the electromagnets being ineluded in a local-battery circuit with the said relay-tongues, a retransmitting-line battery connected through the contact-making lovers of the automatic transmitter, and a connection from the outgoing circuit back through the receiving apparatus so as to curb or govcm the return movements of the latter.

In testimony whereof I have hereunto subscribed my name.

ALEXANDER MUIRHEAD. Witnesses:

A. F. SPOONER, J. S. WITHERs. 

